North American Birds

VOLUME 69 NO3 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

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Page 171 of 211

N O R T H A M E R I C A N B I R D S 482 trels observed. Three off Sonoma 20 Mar (PEL, Nick Lethaby et al.) furnished a first county record. From late Apr through May, double- digit counts were recorded on nine days, with highs of 68 between Monterey and Mendocino 27 Apr (Nathan Hentze), 63 from Mendocino to Del Norte 7 May (PEL, Gary Nunn, JCS, Monte Taylor et al.), and 54 in the vicinity of David - son Seamount, Monterey 6-8 May (AdS et al.). The second record for F.I. was recorded 30 May (†Edward Jenkins). Twenty-two Hawaiian Pe - trels were recorded on these cruises 20 Mar–13 May, with a high of 9 off Mendocino and Hum - boldt 7 May (PEL, Gary Nunn, JCS, Monte Tay- lor et al.). Fewer Cook's Petrels were reported on repositioning cruises, with 17 seen on four dates 20 Mar–13 May, but 145 were seen on a research vessel 6-8 May around Davidson Sea - mount, Monterey (AdS et al.). The difficulty of distinguishing Short-tailed Shearwaters from Sooties clouds our under - standing of typical departure dates of the for- mer, but it appears that only a few linger into Mar (and possibly early Apr). Two seen from shore at the entrance to Humboldt Bay, Hum - boldt 9 Mar (†RbF) were therefore notewor- thy. The tail end of last winter's Black-vented Shearwater incursion provided the first spring record for S.F. in a decade, with 2 at Lands End 10 Mar (Collin Adams, Amanda Starbuck). Single Wedge-rumped Storm-Petrels mist- netted at F.I. 19 Apr and 20 May (ph. Point Blue) provided the fourth and fifth Regional records and the northernmost records to date; the previous three were from Monterey Bay. This species has typically been recorded off California only during warm-water conditions, and these records further exemplify the influx of southern seabirds that accompanied warmer water last winter. The significance of these re - cords was eclipsed by California's second Tris- tram's Storm-Petrel, which was found dead (likely the victim of Burrowing Owl predation) at F.I. 18 Mar (ph. Point Blue); the first was also at F.I., on 22 Apr 2006. A Blue-footed Booby at F.I. 22-24 Apr (Point Blue) provided a rare spring record, but one at the Klamath River mouth 20 Apr (†SMcA), furnishing Del Norte's second record, was far less expected so far north. Twenty-nine Brown Boobies more than doubled our previous spring total. At least 18 were at F.I., with high counts of 12 on 2 & 19 Mar (Point Blue); num - bers there dwindled in Apr and early May but were bolstered by a few arrivals later in May. Elsewhere, 2 were in Monterey, 3 in San Mateo, 2 in S.F., 2 in Marin, and one in Humboldt. The Northern Gannet, now present for three years, was seen at F.I. most days (Point Blue), was de - tected around Alcatraz Island and the Golden Gate Channel, S.F. on a number of occasions May. Greater White-fronted Geese were re - ported from seven counties through 31 May. An ad. blue-morph Snow Goose with 15 white morphs at the Sacramento N.W.R., Glenn 16 May was apparently the second-latest for the n. C.V. (ph. Steve Nord). A Ross's Goose lin - gering around Mountain View through 25 May (Eric Goodill, MMR, MJM) tied the late date for Santa Clara, and Cackling Geese were re - ported from four counties through 29 May. A Brant at the Salinas W.T.P., Monterey 14 May (KVV) was notable for its slightly inland loca - tion. Eurasian Wigeon in six counties through 31 May likewise represented more lingering birds than expected and included the latest for the n. C.V. at the Sacramento N.W.R., Glenn 18 May (†Bob MacMillan). Six Eurasian Teal were reported in five counties through 23 Apr. Male Tufted Ducks continued at Stafford Lake, Marin through 9 Mar (ph. Kevin Keirn, Donna Bray) and Lake Hennessey, Napa through 21 Mar (m.ob.); another was found at Abbotts La - goon, Marin 24 Apr (Tate Snyder, AJ et al.). An unidentified eider was seen off Pigeon Point, San Mateo 13 May (RSTh). Of 3 Long-tailed Ducks, the latest was a lingering male at the Pajaro Dunes, Santa Cruz 6-9 May (NLv et al.). A female Hooded Merganser was on eggs in a nest box at Essex Pond, Humboldt 23 Apr (fide Elizabeth Feucht); another female along the Tuolumne River 16 May (HMR) raised thoughts of a possible first breeding record in Stanislaus. Inland Red-breasted Mergansers were found at Lake Camanche, Amador 13 Apr (DMr) and Crowley Lake, Mono 17 May (LKh). LOONS THROUGH PELICANS Red-throated and Pacific Loons are annual (al- beit in low numbers) inland in early spring, but up to 2 Red-throated Loons at Lexington Reservoir 3-22 May (ph. Stephen Peterson et al.) provided Santa Clara's first May record, and a Pacific Loon at June Lake, Mono 23 May (ph. Phil Carnehl) was similarly late. Few Horned Grebes linger past Apr, so up to 3 at Alviso, Santa Clara 3-9 May (MMR, Gena Zolotar) and one at the Pajaro River, Santa Cruz 16 May (ph. Aaron Gabbe, Craig Fosdick) were notable. Santa Clara's wintering Red-necked Grebes at Calero Reservoir and Coyote Reservoir lin - gered through 9 Mar and 13 Apr, respectively (RPh, Andy Bradshaw, PLD, EFe et al.), but one at Lexington Reservoir 3-17 May (ph. Stephen Peterson et al.) was quite tardy. Dorris Reser - voir hosted Modoc's second Red-necked Grebe 1-2 May (ph. SCR, JLx). Laysan Albatrosses were well represented offshore, with a high of 9 seen from a reposi - tioning cruise between Monterey and Mendocino 20 Mar (JCS, Tom Crabtree et al.). Even more exciting were the high numbers of Murphy's Pe - Stephen C. Rottenborn Michael M. Rogers Jeff N. Davis Ed Pandolfino –––––––––––––––––––––––––––––––––––––– SPRING –––––––––––––––––––––––––––––––––––––– D rought conditions continued to af- fect the entire Region in spring 2015, and temperatures were above aver - age in March and early April before normal- izing. Perhaps related to warm conditions, short-distance migrants such as Pacific-slope Flycatchers, Wilson's Warblers, and Hooded Orioles arrived earlier than average. At South - east Farallon Island, the variety and number of migrant landbirds were exceptional, with several productive waves of migrants. The season's outstanding rarities included an ap - parent Red-backed Shrike x Turkestan Shrike hybrid, California's first Kelp Gull and second Tristram's Storm-Petrel, the Region's third and fourth Gull-billed Terns and fourth and fifth Wedge-rumped Storm-Petrels, and lingering Black Vulture, Rustic Bunting, and Brambling. Abbreviations: C.B.R.C. (California B.R.C.); C.R.P. (Cosumnes River Preserve, Sacramento); C.V. (Central Valley); F.I. (Southeast Faral - lon Island, San Francisco); H.R.S. (Hayward R.S., Alameda); P.R.N.S. (Point Reyes National Seashore, Marin); Point Blue (Point Blue Con - servation Science); S.F. (San Francisco, not State Forest). Reports of exceptional vagrants submitted without documentation are not published. Documentation of C.B.R.C. review species will be forwarded to Tom Benson, Sec - retary, WATERFOWL Surprising numbers of geese lingered into Northern California

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